Disintegrate asm/system.h for S390

Disintegrate asm/system.h for S390.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-s390@vger.kernel.org
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 12ae181..c5c121f 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -46,6 +46,7 @@
 #include <asm/isc.h>
 #include <linux/hrtimer.h>
 #include <linux/ktime.h>
+#include <asm/facility.h>
 
 #include "ap_bus.h"